/*
 * Copyright 2022-2024 兮玥(190785909@qq.com)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.chestnut.system.domain.vo.server;

import com.chestnut.common.utils.Arith;
import com.chestnut.common.utils.ServletUtils;
import lombok.Getter;
import lombok.Setter;
import org.apache.commons.lang3.SystemUtils;
import oshi.SystemInfo;
import oshi.hardware.CentralProcessor;
import oshi.hardware.CentralProcessor.TickType;
import oshi.hardware.GlobalMemory;
import oshi.hardware.HardwareAbstractionLayer;
import oshi.software.os.FileSystem;
import oshi.software.os.OSFileStore;
import oshi.software.os.OperatingSystem;
import oshi.util.Util;

import java.util.LinkedList;
import java.util.List;

/**
 * 服务器相关信息
 *
 * @author 兮玥
 * @email 190785909@qq.com
 */
@Getter
@Setter
public class Server {
	private static final int OSHI_WAIT_SECOND = 1000;

	private AppInfo app = new AppInfo();

	private DataSources dataSources = new DataSources();

	/**
	 * CPU相关信息
	 */
	private Cpu cpu = new Cpu();

	/**
	 * 內存相关信息
	 */
	private Mem mem = new Mem();

	/**
	 * JVM相关信息
	 */
	private Jvm jvm = new Jvm();

	/**
	 * 服务器相关信息
	 */
	private Sys sys = new Sys();

	/**
	 * 磁盘相关信息
	 */
	private List<SysFile> sysFiles = new LinkedList<>();

	public void copyTo() throws Exception {
		SystemInfo si = new SystemInfo();
		HardwareAbstractionLayer hal = si.getHardware();

		setCpuInfo(hal.getProcessor());

		setMemInfo(hal.getMemory());

		setSysInfo();

		setJvmInfo();

		setSysFiles(si.getOperatingSystem());
	}

	/**
	 * 设置CPU信息
	 */
	private void setCpuInfo(CentralProcessor processor) {
		// CPU信息
		long[] prevTicks = processor.getSystemCpuLoadTicks();
		Util.sleep(OSHI_WAIT_SECOND);
		long[] ticks = processor.getSystemCpuLoadTicks();
		long nice = ticks[TickType.NICE.getIndex()] - prevTicks[TickType.NICE.getIndex()];
		long irq = ticks[TickType.IRQ.getIndex()] - prevTicks[TickType.IRQ.getIndex()];
		long softirq = ticks[TickType.SOFTIRQ.getIndex()] - prevTicks[TickType.SOFTIRQ.getIndex()];
		long steal = ticks[TickType.STEAL.getIndex()] - prevTicks[TickType.STEAL.getIndex()];
		long cSys = ticks[TickType.SYSTEM.getIndex()] - prevTicks[TickType.SYSTEM.getIndex()];
		long user = ticks[TickType.USER.getIndex()] - prevTicks[TickType.USER.getIndex()];
		long iowait = ticks[TickType.IOWAIT.getIndex()] - prevTicks[TickType.IOWAIT.getIndex()];
		long idle = ticks[TickType.IDLE.getIndex()] - prevTicks[TickType.IDLE.getIndex()];
		long totalCpu = user + nice + cSys + idle + iowait + irq + softirq + steal;
		cpu.setCpuNum(processor.getLogicalProcessorCount());
		cpu.setTotal(totalCpu);
		cpu.setSys(cSys);
		cpu.setUsed(user);
		cpu.setWait(iowait);
		cpu.setFree(idle);
	}

	/**
	 * 设置内存信息
	 */
	private void setMemInfo(GlobalMemory memory) {
		mem.setTotal(memory.getTotal());
		mem.setUsed(memory.getTotal() - memory.getAvailable());
		mem.setFree(memory.getAvailable());
	}

	/**
	 * 设置服务器信息
	 */
	private void setSysInfo() {
		sys.setComputerName(ServletUtils.getHostName());
		sys.setComputerIp(ServletUtils.getHostIp());

		sys.setOsName(SystemUtils.OS_NAME);
		sys.setOsArch(SystemUtils.OS_ARCH);
		sys.setUserDir(SystemUtils.USER_DIR);
	}

	/**
	 * 设置Java虚拟机
	 */
	private void setJvmInfo() {
		jvm.setTotal(Runtime.getRuntime().totalMemory());
		jvm.setMax(Runtime.getRuntime().maxMemory());
		jvm.setFree(Runtime.getRuntime().freeMemory());

		jvm.setVersion(SystemUtils.JAVA_VERSION);
		jvm.setHome(SystemUtils.JAVA_HOME);
	}

	/**
	 * 设置磁盘信息
	 */
	private void setSysFiles(OperatingSystem os) {
		FileSystem fileSystem = os.getFileSystem();
		List<OSFileStore> fsArray = fileSystem.getFileStores();
		for (OSFileStore fs : fsArray) {
			long free = fs.getUsableSpace();
			long total = fs.getTotalSpace();
			long used = total - free;
			SysFile sysFile = new SysFile();
			sysFile.setDirName(fs.getMount());
			sysFile.setSysTypeName(fs.getType());
			sysFile.setTypeName(fs.getName());
			sysFile.setTotal(convertFileSize(total));
			sysFile.setFree(convertFileSize(free));
			sysFile.setUsed(convertFileSize(used));
			sysFile.setUsage(Arith.mul(Arith.div(used, total, 4), 100));
			sysFiles.add(sysFile);
		}
	}

	/**
	 * 字节转换
	 *
	 * @param size 字节大小
	 * @return 转换后值
	 */
	public String convertFileSize(long size) {
		long kb = 1024;
		long mb = kb * 1024;
		long gb = mb * 1024;
		if (size >= gb) {
			return String.format("%.1f GB", (float) size / gb);
		} else if (size >= mb) {
			float f = (float) size / mb;
			return String.format(f > 100 ? "%.0f MB" : "%.1f MB", f);
		} else if (size >= kb) {
			float f = (float) size / kb;
			return String.format(f > 100 ? "%.0f KB" : "%.1f KB", f);
		} else {
			return String.format("%d B", size);
		}
	}
}
